Questions tagged [missing-data]

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10 views

Filled value in NDVI

I wonder to know if -3000 in this MOD13Q1 product represents missing value? I saw the product which describes the fill value as -3000 and No data value as N/A. I am not sure whether these two values ...
4
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0answers
24 views

Hiding missing values on bar charts in QGIS

I'm trying to hide the bars when there are no values available on my bar charts. This, in order to differentiate missing values from values that are existing but are very close to zero or equal to ...
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0answers
30 views

Sentinel 1 missing data

I´m trying to use the complete descending dataset (VV and VH) for a location in Colombia and must got the same number of scenes by band but it does not; in fact, there are 3 missing years of data for ...
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0answers
47 views

QGIS Vector Geometry Vanished

I've been working on a project, in QGIS 3.16 Hannover (we started the project a while ago, in the Bonn version, but upgraded during the duration of project). Upon project completion we've been asked ...
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0answers
33 views

Road data missing in shapefile downloaded from OpenStreetMap

I am trying to prepare a base map of road network of Cooch Behar District of West Bengal, India. I have been trying to download the OpenStreetMap (OSM) for the district but found that many roads are ...
2
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1answer
81 views

Calculating correlation between points and raster values with missing points (need missing as 0s) (QGIS)

I feel like this should be easy but I'm struggling. I have a raster data set of Topographic Wetness Index (TWI) and a point data set of crop yield. I want to see how TWI and yield are correlated by ...
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0answers
14 views

ArcMap Intersect Tool is missing just one intersect point of two polyline shapefiles?

I'm trying to find the intersect of 2 polyline shapefiles. One shapefile is a long line (of multiparts), the other shapefile is 11 straight lines that "fan out" radially. The ends of the first ...
0
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1answer
95 views

Sentinel-1 missing data gaps between two images GEE [duplicate]

I am trying to export a Sentinel-1 mosaic with the code below. I keep getting this missing data gap between the two images. Even when I export the images separately, and mosaic them myself in ArcGIS, ...
2
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2answers
79 views

Stream Feature generated from DEM is missing data

I tried to search other questions to see if this has been answered but couldn't find anything, so sorry if this is redundant. I use the Hydrology toolset in Spatial Analyst to create a stream feature ...
-1
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1answer
50 views

How to convert missing values to the mean of the other values in R? [closed]

I need to convert the missing values of a column in a dataframe with the rest of values of this column, grouped by Districts and Month. This is a sample of my df1: Date Day Month Year ...
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0answers
23 views

Geopackage drops fields during import [closed]

When I use the ogr2ogr -f command to create a geopackage the first layer imports correctly but every layer after that drops fields. Can anybody explain why it does this?
3
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1answer
264 views

Interpolating LiDAR intensity images in R?

I'd like to generate 0.5 m intensity images using lidR, but the resulting raster is full of pits. Here's a reproducible example: library(lidR) LASfile <- system.file("extdata", "MixedConifer.laz", ...
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2answers
1k views

Getting a masked raster with no NAs and sum pixels within overlaying polygon?

I have done an IDW interpolation in R for precipitation data following the routine of Manny Gimond (https://mgimond.github.io/Spatial/interpolation-in-r.html) to get precipitation inside a catchment. ...
1
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1answer
129 views

Placing Excel Data in ArcMap/ArcScene similar to Image Georeferencing

I have XYZ-dataset of Temperature Data in Excel, with no (Lat, Lon) added. Every time when I try to display the Data in ArcScene the Programm tells me, that a Spacial Reference is missing (of course)....
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3answers
185 views

Missing feature from Shapefile

I have loaded a shapefile into QGIS that has been generated in a third party piece of software. When I view the attributes table, all items are there (20 survey lines), when I view the map only 19 ...
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0answers
183 views

Only some points visible in CSV layer

I understand that this question has been asked before in one form or another, but unfortunately those answers haven't been able to solve my issue. I've imported a .csv file into QGIS and all the ...
2
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1answer
252 views

Georeferencer - GDAL is missing on the QGIS 3

OS - ArchLinux 64bits SPECS - i3-3220 - 6gb ram QGIS 3.0.3 installed as follow. $ sudo pacman -S qgis gdal python-gdal python-psycopg2 python-owslib python-yaml python-pygments $ yaourt -S python-...
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0answers
41 views

Point/Feature to Raster-unwanted Grid of missing Data raster Cells-ArcGIS10.5

I tried to convert some point data (points on a regular grid of 100m by 100m) with the Feature to Raster Tool and the Point to Raster Tool (Rastersize of 100m) but in the resulting Rasterfile there is ...
1
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1answer
598 views

QGiS - Values missing from graduated style

I'm trying to do the very simple/standard task of presenting points (and then polygons created from them) as a graduated colour style, however many points are missing, evinced from the lowest number ...
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1answer
843 views

Features show on data view, but not in Attribute table?

There are 966 points for tree data that was collected in the field. When I try to open the attribute table only 2 points' data show up. I've tried to create layer from selected, because when I choose ...
1
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0answers
168 views

Space-Time Principal Component Analysis with Missing Lat/Long Data [closed]

I am looking to run a space-time Principal Component Analysis on Shotspotter data from Brockton, MA: http://justicetechlab.org/data/. Shotspotter sensors record the timing, location, and number of ...
2
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2answers
4k views

Replace NA's with 0 for large raster data using R?

I want to replace all NA values in a large raster with 0. I found this answer: Replace NA's with 0 for raster data using R? #getting a raster library(raster) f <- system.file("external/test....
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1answer
252 views

Adding missing locations on OpenStreetMap programmatically for Android application?

i am working on android application using osm. Many locations are not on osm that google map providing. But i need to show all missing locations on osm also. what can i do to solve this problem? Can ...
1
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0answers
54 views

Missing Values in Crop identification using Python? [closed]

I am developing a Python based process that classify crops via time series analysis. Due to clouds there are many missing values. My problem is how to assign a value to these pixels that would be near ...
1
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3answers
651 views

ArcGIS Attribute Table - Latitude, no Longitude

I received a shapefile from an online source, and in the attribute table it shows a column and values for latitude; but there is nothing for longitude. I have not used ArcGIS for some time, and I don'...
0
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1answer
255 views

Python add-in button tool giving saying missing toolbar when I add it onto my map?

I am looking to create a button that when clicked, clears feature classes and tables created from another tool. I set up the button and installed it but every time I add it to the map with a toolbar ...
4
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3answers
1k views

Merging one DEM into another to fill in missing data using QGIS?

I have a LiDAR dataset with some missing data right in the middle of my map. I would like to use a 5m DEM to fill in the missing areas. Is there a way in QGIS to merge the two but only use the 5m ...
2
votes
1answer
1k views

R kriging cross validation returns NA for all prediction points?

I'm trying to cross-validate the results of an [auto]Krige output but for some unknown reason the results of both autoKrige.cv (automap package) and krige.cv (gstat package) return NA for all values (...
6
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1answer
417 views

Zones missing after running zonal statistics in ArcGIS Spatial Analyst?

I have a problem using zonal statistics in ArcGIS. My raster contains values/data with 30m cells. I had several vector layers, containing administrative subdivisions of Belgium. I have converted the ...
1
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0answers
75 views

Extracting specific OpenStreetMap tags in ArcGIS Desktop? [duplicate]

The purpose of my research is to look into public ITS (Intelligent Transport System). To do this in a realistic way I need not only the city map but also the public transport routes. I work with ...
1
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0answers
74 views

Filling missing pixels of ASTER DEM

I need to perform hydrological analyses and map design purposes (hillshade creation) on a region far north. It is too northern to be covered by the SRTM DEM, therefore I am using the ASTER DEM. ...
1
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0answers
29 views

Generating missing yearly data, based on a more detailed temporal data set

I have several very large raster data sets of land use classifications (ie. forest, wetland, argicultural, etc). The most comprehensive data spans 2009-2015. I have reclassified this data to match ...
0
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1answer
492 views

Filling null attributes with mean attributes of neighboring polygons using ArcGIS Desktop?

I have a layer of polygons, where in some polygons there is missing data (null). I would like to fill these missing attributes by the average attributes in neighboring polygons. Is there a simple way ...
3
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2answers
1k views

Error gap-filling Landsat 7 SLC-off with QGIS 2.18.3 on Windows 10

I am trying to gap-fill Landsat 7 SLC-off images with open-source software as explained in the comment below this post. I'm new to QGIS and have almost no knowledge with Python (I'm a GIS novice ...
2
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0answers
79 views

Missing Observations in Zonal Statistics Tool

I am using zonal statistical tools. I have field boundary shapefile which has 1,062,063 observations. I am using zonal statistical as table tool to obtain precipitation values from raster layer. ...
2
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0answers
59 views

Finding pre-processed MODIS products?

I am trying to recognize burnt areas based on some MODIS products and I just realized that I am missing a bunch pixels from the coastline masking. As you can understand that is an issue because I am ...
4
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0answers
150 views

Why do first returns have more blanks than last returns in LiDAR data? [closed]

I'm working on an ASCII LiDAR file that has the first and last pulse returns included. Can anyone tell me why a first pulse return may come back with more blank spaces in the data than a last pulse ...
1
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1answer
54 views

QGIS - Have spreadsheet with col from 0% to 100% plus null want 100 bin gradient plus one more for null

Newbie alert. Have a spreadsheet with no geo; has a col with values in there from 0% to 100%, plus several blanks/nulls. Ideally would like a 100 step (bin) gradient fill from 0 (100% black) to 100 (...
4
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1answer
841 views

How to generate missing points in GPS trajectories?

I have some GPS trajectories that include gps locations recorded on variable frequencies (every 1 min ,5 min , 20 min,etc.)using a geographic projection WGS84. In my work, i need a fine-grained GPS ...
2
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0answers
1k views

QGIS Polygons missing after saving edits

Right, I am slightly worried. I opened QGIS this morning to discover that part of the work I did yesterday was not there (the attributes where present in the table, but were not digitised anywhere on ...
0
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1answer
102 views

How can I find the missing data from the downloaded bulk TRMM data?

I have downloaded TRMM daily precipitation estimates for Indian Sub-continent from 1988 to present. I see that there are a lot of missing data days. I was wondering how can I possibly detect the daily ...
0
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1answer
397 views

Fusion Tables missing from Google Drive [closed]

Many of my Fusion Tables are missing off my Google Drive account, has anyone else experienced, and hopefully resolved, this issue?
1
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1answer
794 views

Parts of geometry disappearing in QGIS export to Illustrator PDF?

I'm having this issue with certain polygons when I export to PDF. Everything looks fine in QGIS, everything fine in print composer, everything fine in the PDF as viewed in Preview or Adobe Reader. ...
1
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2answers
739 views

Export GRASS raster as GeoTIFF : nodata values exported as -nan (what happens in R?)

I am using the package raster to work with GeoTIFF raster files which I exported from GRASS using r.out.gdal. GRASS assigned the value -nan to some raster files (type FLOAT32) for missing values. ...
3
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0answers
399 views

Missing data and negative predictions when kriging daily rainfall? [closed]

I want to perform the interpolation of daily rainfall data for 7 years. I am now working on python using arcpy module. I face several problems while performing interpolation Some day there is no ...
2
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1answer
777 views

Kriging from raster with missing data in ArcGIS

I have MODIS satellite imagery that depicts a range of surface temperatures. However, many of the cells are missing values. I think I need to perform Kriging in order to obtain an average value for ...
1
vote
1answer
1k views

How to treat missing values as null

I have an excel file with missing values encoded as blanks and I want this excel file to be converted into DBF but with the conversion process, the blanks (missing values) become 0. The reason I am ...
1
vote
1answer
264 views

ArcGIS: Assigning values to missing attribute data for line layers

I have a large road network layer with an AGE attribute associated per segment. In some occasions, I would have segments A -> B -> C with segment B with no value for the AGE field. In other ...
8
votes
1answer
372 views

Interpolating points observed with different time duration

I am doing spatial interpolation with a group of points. Some points have complete observation of events: for a period of 24 hours we have observed N events in each point. These points have N events....
12
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1answer
15k views

Replace NA's with 0 for raster data using R?

I am new in R. How can I replace NA's with 0 for my raster data which have spatial information?